By mistake "update evolution kit" was selected in the menu, and the update startet, but never finishes because of my firmware (At least I think that is why).

I have a sek-2500, but only firmware 1350 on the TV. I do not have the original evolution kit, so can not just switch back. My question is now: How can I update my firmware, when I can't get to the tv menu, because of the evo kit installation starting every time I turn on the tv. I can get to the service menu no problem, but it is a bit above my knowledge, so I turn to you for advise.